In wall Home Cinema
Hey Tux,
Nice job, I think in wall is a great solution for home cinema and very good for music.
Apart from the sonics / baffle step / free low frequency boost and perfect WAF, the real bonus is you can spend 90% of the speaker budget on the drivers...not the cabinet!
Add some mini DSP for crossovers if required, or just run mini array's of full ranger drivers and use a good AV reciever to crossover to corner placed subs... two or three 12 inch drivers is nice!
Even better use a good Oppo Blu Ray with onboard 32 Bit ESS DAC's as the source, run analog out to your own power amps. If you dont want to DIY power amp kits just buy a good 5 Ch power amp or even 5 stereo NAD, Cambridge Audio or any good value power amps.
Please dont let out the attack dogs....

But in my experience, and only once you reach the higher performance end of the scale, you will hear the benefit if you use good solid core speaker cable.
DIY - Use 0.8mm silver plated solid core copper, preferably single crystal high purity with 1 micron thick silver plating. Use crimps not solder where possible, and seal all joints with glue filled heat shrink covers.
Cover the cable with paper drinking straws or soft cotton sleeving, then cover in teflon tubing, then twist together and finally cover in heat shrink.
Use 0.4mm or 0.5mm for inter connects, Eichmann plugs are great.
Cheers
Derek.